Do you have an accountant?
From what
THINK I know, it would make more sense financially to have a different business for each thing you do.
This tax year you can now earn £7,475 before you pay any tax.
So maybe if you have 3 businesses earning exactly that you could earn £22,425 per annum and pay 0 tax.
Congrats on the bouncy castle business, you have loads of 'stock' so I imagine you are doing very well